I'm using the USPTO's EFS-WEB, and after spending an hour adding documents to a new application, I had to take a break. I wasn't active for an hour and my application disappeared completely. Is this normal? Is there any way to save it? Also, is it possible to work on two applications at once? (I'm a registered user.)
If you are registered user you can save your work before submission. See the EFS-Web Quick Start documentation.